<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h1>登录</h1>
<div>
  <input type="text" placeholder="用户名" v-model="user.username"><br>
  <input type="password" placeholder="密码" v-model="user.password" ><br>
  <input type="button" @click="login()" value="登录">
</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
 <script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
     <script>
         let v = new Vue({
             el:"body>div",
             data:{
                 user:{
                   username:"",
                   password:"",
                 }
             },
             methods:{
                 login(){
                   axios.post("/login",v.user).then(function (response) {
                     if(response.data==1){
                       alert("登录成功")
                     }else if(response.data==2){
                       alert("密码错误")
                     }else {
                       alert("用户不存在")
                     }
                   })
                 }
             }

         })
     </script>
</body>
</html>